Home / 20,505.22-30,717.87-12,985.72

Finding the Fourth Proportional to 20,505.22, 30,717.87 and 12,985.72

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Solution

The fourth proportional to 20,505.22, 30,717.87 and 12,985.72 is: 19,453.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,505.22 : 30,717.87 = 12,985.72 : x
  2. Step 2: Convert to fraction form
    20,505.22/30,717.87 = 12,985.72/x
  3. Step 3: Cross multiply
    20,505.22x = 30,717.87 × 12,985.72
  4. Step 4: Simplify right side
    20,505.22x = 398,893,658.82
  5. Step 5: Solve for x
    x = 398,893,658.82/20,505.22
  6. Step 6: Final answer
    x = 19,453.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.